Category: chiral-nitrogen-ligands

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called A Mild One-Pot Reduction of Phosphine(V) Oxides Affording Phosphine(III) and Their Metal Catalysts, published in 2021-03-22, which mentions a compound: 1663-45-2, mainly applied to one pot reduction phosphine oxide chlorodisilane reducing reagent oxalylchloride; phosphine derivative transition metal complex preparation; crystal structure chlorophosphonium azolium salt; mol structure chlorophosphonium azolium salt, Recommanded Product: 1,2-Bis(diphenylphosphino)ethane.

The metal-free reduction of a range of phosphine(V) oxides employing oxalyl chloride as an activating agent and hexachlorodisilane as reducing reagent was achieved under mild reaction conditions. The method was successfully applied to the reduction of industrial waste byproduct PPh3(V) oxide, closing the P cycle to cleanly regenerate PPh3(III). Mechanistic studies and quantum chem. calculations support the attack of the dissociated chloride anion of intermediated phosphonium salt at the Si of the disilane as the rate-limiting step for deprotection. The exquisite purity of the resultant phosphine(III) ligands after the simple removal of volatiles under reduced pressure circumvents laborious purification prior to metalation and has permitted the facile formation of important transition metal catalysts.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 111-24-0, is researched, SMILESS is BrCCCCCBr, Molecular C5H10Br2Journal, Article, Angewandte Chemie, International Edition called Few-Unit-Cell MFI Zeolite Synthesized using a Simple Di-quaternary Ammonium Structure-Directing Agent, Author is Lu, Peng; Ghosh, Supriya; Dorneles de Mello, Matheus; Kamaluddin, Huda Sharbini; Li, Xinyu; Kumar, Gaurav; Duan, Xuekui; Abeykoon, Milinda; Boscoboinik, J. Anibal; Qi, Liang; Dai, Heng; Luo, Tianyi; Al-Thabaiti, Shaeel; Narasimharao, Katabathini; Khan, Zaheer; Rimer, Jeffrey D.; Bell, Alexis T.; Dauenhauer, Paul; Mkhoyan, K. Andre; Tsapatsis, Michael, the main research direction is MFI zeolite quaternary ammonium structure directing agent synthesis; adsorption; catalysis; di-quaternary structure directing agents; pentasil; ultrasmall crystalline domain.Quality Control of 1,5-Dibromopentane.

Synthesis of a pentasil-type zeolite with ultra-small few-unit-cell crystalline domains, which is called FDP (few-unit-cell crystalline domain pentasil), is reported. FDP is made using bis[1,5-(tributylammonium)]pentamethylene cations as structure directing agent (SDA). This di-quaternary ammonium SDA combines Butylammonium, in place of the one commonly used for MFI synthesis, Propylammonium, and a five-carbon nitrogen-connecting chain, in place of the six-carbon connecting chain SDAs that are known to fit well within the MFI pores. X-ray diffraction anal. and electron microscopy imaging of FDP indicate ca. 10 nm crystalline domains organized in hierarchical micro-/meso-porous aggregates exhibiting mesoscopic order with an aggregate particle size ≤ 5μm. Al and Sn can be incorporated into the FDP zeolite framework to produce active and selective methanol-to-hydrocarbon and glucose isomerization catalysts, resp.

When you point to this article, it is believed that you are also very interested in this compound(111-24-0)Quality Control of 1,5-Dibromopentane and due to space limitations, I can only present the most important information.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Visible and ultraviolet absorption of some derivatives of 2,4-dioxotetrahydroquinazoline and related open-chain compounds》. Authors are Grammaticakis, Panos.The article about the compound:2-Aminoquinazolin-4(3H)-onecas:20198-19-0,SMILESS:O=C1NC(N)=NC2=C1C=CC=C2).Name: 2-Aminoquinazolin-4(3H)-one. Through the article, more information about this compound (cas:20198-19-0) is conveyed.

The visible and ultraviolet light absorption of derivatives of 4-oxotetrahydroquinazoline (I) and of anthranilic acid are measured. Curves for the following derivatives of I acid are measured. Curves are given for the following derivatives of I: 2-oxo-, m. 263-5°, 1-methyl-2-oxo-, m. 288-90°, 3-phenyl-2-oxo-, m. 278°, 2-thio-, m.inst. 315°, 2-imino- m.inst. 310°, and 3-phenyl-2-thio-, m.inst. 307°; ο-H2NOCC6H4NHCONH2, m.inst. 218°; ο-MeO2CC6H4NHCONH2, m.inst. 350°; ο-MeO2CC6H4NHCSNH2, m.inst. 288°; and the following ο-substituted PhNHCONHPh: ο-CONH2, m.inst. 239°, ο-COOH, m.inst. 235°, ο-CO2Me, m. 143-4°, and ο-CN, m. 177°.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Tri(naphthalen-1-yl)phosphine, is researched, Molecular C30H21P, CAS is 3411-48-1, about Palladium-Catalyzed Cascade Aryl Addition/Intramolecular Lactonization of Phthalaldehyde To Access 3-Aryl- and Alkenylphthalides.Application In Synthesis of Tri(naphthalen-1-yl)phosphine.

A palladium-catalyzed addition of arylboronic acids to phthalaldehyde, followed by an intramol. lactonization to access 3-substituted phthalides, is described. The procedure tolerates a series of functional groups, such as methoxyl, fluoro, chloro, and trifluoromethyl groups. It represents a procedure for the synthesis of 3-substituted phthalides.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis and antimicrobial activity of new 3,5-diarylidene-4-piperidone derivatives, published in 2016, which mentions a compound: 6684-39-5, mainly applied to diarylidene piperidone preparation antibacterial antifungal, SDS of cas: 6684-39-5.

Three series of heteroaromatic analogs diarylidene-4-piperidones I [Ar = C6H5, 4-FC6H4, 2-thienyl, etc.], [diarylidene(substituted)sulfonyl]piperidin-4-ones II [R1 = 3,5-Cl2-2-OHC6H2, 4-Cl-3-pyridyl, 3,5-Me2-4-isoxazolyl, etc.] and N-alkylcarbonyl-diarylidene-4-piperidones derivatives e.g., III, were synthesized. All the synthesized compounds were evaluated for their antimicrobial activity against six microbial strains, among them II [R1 = 3,5-Cl2-2-OHC6H2] showed best antifungal activity against Aspergillus niger and A. fumigatus. Structural elucidation of the synthesized compounds was realized based on various spectroscopic methods.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-(4-Pyridyl)-1H-tetrazole, is researched, Molecular C6H5N5, CAS is 14389-12-9, about Using solid-state density functional theory and terahertz spectroscopy to spectroscopically distinguish the various hydrohalide salts of 5-(4-pyridyl)tetrazole, the main research direction is pyridyltetrazole hydrobromide hydrochloride solid state density functional far IR; crystal structure pyridyltetrazole hydrobromide hydrochloride; mol structure pyridyltetrazole hydrobromide hydrochloride; tetrazole pyridyl hydrobromide hydrochloride crystal mol structure far IR.Safety of 5-(4-Pyridyl)-1H-tetrazole.

The crystal structures and exptl. THz spectra of the isostructural hydrobromide and hydrochloride salts of 5-(4-pyridyl)tetrazole were reproduced using solid-state d. functional theory as implemented in CRYSTAL09. The effect of the halide size was studied to determine the influence on the low energy lattice and mol. vibrations exhibited at 10-100 cm-1, known as the terahertz (THz) region. Using solid-state DFT, the normal modes of these THz vibrations were determined and the mass and size of the halide anion has a significant effect in this region. A trend was observed in the frequencies in the terahertz region, such that increasing the mass of the anion, produces an overall red shift in the frequency. Crystallog. data are given.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Pan, Ting; Ding, Yanchao; Wu, Liyang; Liang, Liting; He, Xin; Li, Qianwen; Bai, Chuan; Zhang, Hui researched the compound: 2-Chloro-5-pyridinesulfonyl chloride( cas:6684-39-5 ).Computed Properties of C5H3Cl2NO2S.They published the article 《Design and synthesis of aminothiazole based Hepatitis B Virus (HBV) capsid inhibitors》 about this compound( cas:6684-39-5 ) in European Journal of Medicinal Chemistry. Keywords: antiviral HBV capsid protein inhibitor aminothiazole preparation structure activity. We’ll tell you more about this compound (cas:6684-39-5).

The capsid assembly is an essential step for Hepatitis B Virus (HBV) life cycle and is an important target for anti-HBV drug development. In this report, we identified a hit compound with aminothiazole structure by the high throughput screening (HTS) which inhibited the interaction of HBV capsid protein within the cells. The structure hopping and SAR studies of the hit compound afforded compound 79 with potent anti-HBV replication activity and good basic drug-like properties. The working mechanism studies showed that compound 79 could bind to the similar binding site of known HBV capsid inhibitor with heteroaryldihydropyrimidine (HAP) scaffold, through similar hydrophobic interactions but with a different hydrogen bond. This compound exerted potent inhibitory effect upon HBV production, either in cell culture or in mice with no obvious acute toxicity. We propose that further development of this compound could lead to novel potent anti-HBV inhibitors that target HBV capsid assembly.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Bootharaju, Megalamane S.; Lee, Sanghwa; Deng, Guocheng; Chang, Hogeun; Baek, Woonhyuk; Hyeon, Taeghwan published an article about the compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2,SMILESS:P(CCP(C1=CC=CC=C1)C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4 ).Synthetic Route of C26H24P2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:1663-45-2) through the article.

Ligand protected metal nanoclusters (NCs) are an emerging class of functional materials with intriguing photophys. and chem. properties. The size and mol. structure play an important role in endowing NCs with characteristic optical and electronic properties. Modulation of these properties through the chem. reactivity of NCs is largely unexplored. Here, we report on the synthesis of self-assembled Ag2Cl2(dppe)2 clusters through the ligand-exchange-induced transformation of [Pt2Ag23Cl7(PPh3)10] NCs [(dppe): 1,2-bis(diphenylphosphino)ethane; (PPh3): triphenylphosphine]. The single crystal x-ray structure reveals that two Ag atoms are bridged by one dppe and two Cl ligands, forming a Ag2Cl2(dppe) cluster, which is subsequently self-assembled through dppe ligands to form [Ag2Cl2(dppe)2]n. Importantly, the Ag2Cl2(dppe)2 cluster assembly exhibits high photoluminescence quantum yield: ≈18%, which is attributed to the metallophilic interactions and rigidification of the ligand shell. We hope that this work will motivate the exploitation of the chem. reactivity of NCs as a new path to attain cluster assemblies endowed with enhanced photophys. properties.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 14389-12-9, is researched, Molecular C6H5N5, about Safe and fast tetrazole formation in ionic liquids, the main research direction is carbonitrile azide cycloaddition ionic liquid; tetrazole preparation; ionic liquid cycloaddition solvent.Computed Properties of C6H5N5.

The [2 + 3]-cycloaddition of nitriles and azides is reliable for intramol. reactions, but the hazards with volatile azides in intermol. reactions are tremendous. Zinc catalysis in aqueous solution is a magnificent improvement, but requires the removal of the zinc salts from the acidic product. The use of safe solvents featuring low vapor pressure and good solubility of NaN3, is reported. Ionic liquids based on alkylated imidazoles combined with microwave heating turned out to be a solution for the given tasks.

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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1,2-Bis(diphenylphosphino)ethane( cas:1663-45-2 ) is researched.Application of 1663-45-2.Faujdar, Hemlata; Spannenberg, Anke; Kaur-Ghumaan, Sandeep published the article 《Structural and HER studies of diphosphine-monothiolate complexes [Fe2(CO)4(μ-naphthalene-2-thiolate)2(μ-dppe)] and [Fe2(CO)4(μ-naphthalene-2-thiolate)2(μ-DPEPhos)]》 about this compound( cas:1663-45-2 ) in Inorganica Chimica Acta. Keywords: iron diphosphine thiolate complex preparation crystal structure cyclic voltammetry; hydrogen evolution reaction catalyst iron diphosphine thiolate complex. Let’s learn more about this compound (cas:1663-45-2).

Two new compounds [Fe2(CO)4(μ-naphthalene-2-thiolate)2(μ-dppe)] 1 and [Fe2(CO)4(μ-naphthalene-2-thiolate)2(μ-DPEPhos)] 2 with chelating phosphine ligands were synthesized and characterized {dppe = 1,2-Bis(diphenylphosphino)ethane and DPEPhos = (Oxydi-2, 1-phenylene)bis(diphenylphosphine)}. The bridging coordination mode of the diphosphine ligand in complex 1 was confirmed by x-ray crystallog. Complexes 1 and 2 were further evaluated as catalysts for the hydrogen evolution reaction (HER) by electrochem. studies. Complex 1 showed better stability whereas complex 2 degraded in the presence of acids.

As far as I know, this compound(1663-45-2)Application of 1663-45-2 can be applied in many ways, which is helpful for the development of experiments. Therefore many people are doing relevant researches.

Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis